JEE Main 2022 (Online) 27th June Morning Shift | Dual Nature of Radiation Question 65 | Physics

An $$\alpha$$ particle and a carbon 12 atom has same kinetic energy K. The ratio of their de-Broglie wavelengths $$({\lambda _\alpha }:{\lambda _{C12}})$$ is :

$$1:\sqrt 3 $$

$$\sqrt 3 :1$$

$$3:1$$

$$2:\sqrt 3 $$

JEE Main 2022 (Online) 26th June Evening Shift

MCQ (Single Correct Answer)

-1

A metal surface is illuminated by a radiation of wavelength 4500 $$\mathop A\limits^o $$. The ejected photo-electron enters a constant magnetic field of 2 mT making an angle of 90$$^\circ$$ with the magnetic field. If it starts revolving in a circular path of radius 2 mm, the work function of the metal is approximately :

1.36 eV

1.69 eV

2.78 eV

2.23 eV

JEE Main 2022 (Online) 26th June Morning Shift

MCQ (Single Correct Answer)

-1

An electron with speed v and a photon with speed c have the same de-Broglie wavelength. If the kinetic energy and momentum of electron are E_e and p_e and that of photon are E_ph and p_ph respectively. Which of the following is correct?

$${{{E_e}} \over {{E_{ph}}}} = {{2c} \over v}$$

$${{{E_e}} \over {{E_{ph}}}} = {v \over {2c}}$$

$${{{p_e}} \over {{p_{ph}}}} = {{2c} \over v}$$

$${{{p_e}} \over {{p_{ph}}}} = {v \over {2c}}$$

JEE Main 2022 (Online) 25th June Evening Shift

MCQ (Single Correct Answer)

-1

A proton, a neutron, an electron and an $$\alpha$$ particle have same energy. If $$\lambda$$_p, $$\lambda$$_n, $$\lambda$$_e and $$\lambda$$_a are the de Broglie's wavelengths of proton, neutron, electron and $$\alpha$$ particle respectively, then choose the correct relation from the following :

$$\lambda$$_p = $$\lambda$$_n > $$\lambda$$_e > $$\lambda$$_a

$$\lambda$$_a < $$\lambda$$_n < $$\lambda$$_p < $$\lambda$$_e

$$\lambda$$_e < $$\lambda$$_p = $$\lambda$$_n > $$\lambda$$_a

$$\lambda$$_e = $$\lambda$$_p = $$\lambda$$_n = $$\lambda$$_a

PREVIOUS NEXT

Questions Asked from Dual Nature of Radiation (MCQ (Single Correct Answer))

Number in Brackets after Paper Indicates No. of Questions